Even though I would prefer it could maintain the same element type defined for the original base mesh instead of using always tets for the refinements, I find the adaptive mesh refinement tool a very convenient and useful way to validate the mesh independence of results ... when it works!:
When the refinements are applied in a zone with some kind of singularity the results diverge meaning that this tool/procedure is not applicable and you have to get rid of the singularity before trying any kind of mesh refinement (either with this tool or any other option).
That´s all fine, but my doubt appears when I get a graph, different from those two unequivocal ones, like this:
In this case, does this mean I can consider results converge somewhere between 900 and 1300 MPa? I reckon the answer is NO because the icon next to the convergence branch indicates failure and this is not exactly an accurate outcome anyway!.
How should then such an "oscillating convergence" be interpreted? (the outcome is the same when the refinement is manually defined with mesh sizing options so...)